Switch to new HTTP API and force use of keepalives in a socket per client #44
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I made a switch from http.createClient to http.request, the new API. I also made a custom agent for each client that restricts a client to one socket, otherwise the default maxSockets of 5 means each new command to Selenium opens a new connection to the server. When dealing with Saucelabs, the Selenium server is quite a long way away, so the socket open time becomes quite significant.